LSD lock up data?

#1

I vaguely recall someone planning to gather data on LSD lock up using the “torque wrench on a lug nut” method. Is that data somewhere, and if not, does anyone know what range of values to expect?

#2

Less than 50ft-lb for used.

Mid 50s rebuilt.

Greater than 60 and you move into…you move into an area that needs structure.

To test using the goober-in-the field method: Jack-up the passenger tire. Choose a lug nut and set your torque wrench at 40. Does the wheel spin or the wrench click? Move up in torque until it spins.Move back down in torque until it clicks. You’ll hone in on a +/- range of about 3ft-lbs.

I hope this helps, but at this time it means nothing.

Regards, robert Patton

#3

Robert, What would greater than 60 do to improve handling?

#4

Steve - anyone can correct me if I’m wrong but it isn’t handling so much as improving the car’s ability to put power down on corner exit.

#5

Jim gets the “bingo” prize of the day.Think wheel spin at RA’s turn 7.

Regards, Robert Patton

#6

I agree with Jim. Last December at RRR I tightened up the rear bar for handling reasons, and immediately noticed at the carousel midway from apex to track-out that I was bouncing off the rev limiter in 3rd. I didn’t get any faster, but my RR tire was spinning like mad. I need to budget some money for a clutch pack rebuild.

I’d wanted to gather some baseline data on diff torque readings from a wide selection of cars at CMP, but the mayhem on Saturday kind of diverted my focus. Will try again at RA.

#7

Patton wrote:

[quote]Jim gets the “bingo” prize of the day.Think wheel spin at RA’s turn 7.

Regards, Robert Patton[/quote]

That just so happens to be a turn I would like to forget.

#8

I had mine rebuilt (thanks Digel) in Jan. Noticed it seemed much better coming out of turns (especially low speed) at CMP.

Brendan has my core and I think is rebuilding it so if anyone wants to just swap out I’m sure he is game. Pretty reasonable $$$-wise too.